on painting skin
imo painting skin is more about lighting than shadows or really anything else? if you create a dark base and build light up on top of it the shadows will form naturally.
a big thing is the coloring of the cheekbone area, it is NOT always like this. coloring the cheekbones is completely determined by the MOUTH!
in its most basic form the corners of the nostrils connect to the corners of the mouth and coloring the cheekbones should be determined based on the line between them! light hits off the highest point on the cheekbone and moves outward from there, a scrunched up face would have fewer highlights and more shadows for this reason.








